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Surface-treating agent for vulcanized rubber

a technology of vulcanized rubber and surface treatment agent, which is applied in the direction of synthetic resin layered products, polyurea/polyurethane coatings, engine components, etc., can solve the problems of gas leakage, abraded rubber coating layer on the surface of gaskets, and rubber coating layer of rubber elastic sliding parts, etc., to reduce friction, improve abrasion resistance, and reduce the hardness of the binder componen

Active Publication Date: 2019-01-29
NOK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a surface-treating agent for vulcanized rubber that improves abrasion resistance and product torque evaluation. The agent contains a hard coating film that can be obtained without reducing the hardness of the binder component. The agent also includes a specific fluororesin particles dispersed in an organic solvent solution, which increases the stability of the surface-treating agent. The agent can be used for various rubber parts and can effectively prevent adhesion, reduce friction, and improve abrasion resistance. The surface-treating agent includes an isocyanate group-containing 1,2-polybutadiene that has excellent adhesion and compatibility with rubber. The addition of a hydroxyl group-containing component further enhances the molecular weight and adhesion of the polybutadiene resin.

Problems solved by technology

When the vibration of an engine is further added to these conditions, the rubber coating layer on the surface of the gasket is abraded, and gas leakage may occur.
Moreover, the rubber coating layer of rubber elastic sliding parts, such as bearing seals and oil seals, is abraded due to repeated sliding, and oil leakage may occur.
This caused the problem of poor workability during the coating process.
Furthermore, as a result of the reaction between water and the isocyanate group, importing high molecular weight to 1,2-polybutadiene was prevented, and there were drawbacks that the abrasion resistance, peeling resistance, and sliding properties of the surface treatment layer were inferior.
However, this method did not use a fluororesin, such as polytetrafluoroethylene, and there was thus a problem that the coating film was peeled due to adhesion during high temperature compression, and friction and abrasion at high surface pressure.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050]

PTFE resin particles (Fluon 172J, produced by 22 parts by AGC Seimi Chemical Co., Ltd.; particle size: 0.2 weightμm)Oligomer-based, fluorine-containing surfactant 4 parts by (Surflon S-611, produced by AGC Seimi Chemical weightCo., Ltd.)NCO group-containing 1,2-polybutadiene 98 parts by (TP-1001, produced by Nippon Soda Co., Ltd.;weighta butyl acetate solution haying a solid matters content of 50 wt. %)Butyl acetate [AcOBu]876 parts by weight

A surface-treating agent comprising the above components (total: 1000 parts by weight) was prepared, and each of the following items was measured and evaluated.

[0051]Solution stability: The surface-treating agent was prepared in a glass vessel, and the presence of precipitation was visually observed over time.[0052](Evaluation)[0053]◯: No sedimentation[0054]Δ: Occurred after a while[0055]X: Occurred immediately

[0056]Binder hardness: Only the binder component of the coating agent (except for the fluororesin particle component) was applied t...

example 2

[0074]In Example 1, the amount of the NCO group-containing 1,2-polybutadiene was changed to 77 parts by weight, the amount of butyl acetate was changed to 868 parts by weight, respectively, and 29 parts by weight of an OH group-containing fluororesin composition solution (Defensa TR-103, produced by DIC Corporation; OH value: 4.1 mgKOH / g solution, a MIBK-AcOBu-MEK mixed solvent solution having a solid matters content of 30 wt. %) was further used.

example 3

[0075]In Example 1, the amount of the PTFE resin particles was changed to 21 parts by weight, the amount of the NCO group-containing 1,2-polybutadiene was changed to 90 parts by weight, the amount of butyl acetate was changed to 878 parts by weight, respectively, and 8 parts by weight of silicone oil (KF-96H-1,000,000 cs, produced by Shin-Etsu Chemical Co., Ltd.) was further used.

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Abstract

A surface-treating agent for vulcanized rubber, comprising, based on 100 parts by weight, as solid matters, of isocyanate group-containing 1,2-polybutadiene, an organic solvent solution containing 10 to 160 parts by weight of fluororesin particles and 2.5 to 20 parts by weight of a perfluoroalkyl group-containing oligomer-based, fluorine-containing surfactant as a dispersant. The surface-treating agent for vulcanized rubber improves the solution stability of the organic solvent solution, improves the further hardness of the entire coating film formed from the surface-treating agent, abrasion resistance, and product torque evaluation, and is effectively used as, for example, a coating agent for seal lip parts of oil seals.

Description

RELATED APPLICATION[0001]This application is a 35 U.S.C. § 371 national phase filing of International Patent Application No. PCT / JP2015 / 076800, filed Sep. 18, 2015, which claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2014-192212, filed Sep. 22, 2014, the entire disclosure of which is hereby expressly incorporated by reference.TECHNICAL FIELD[0002]The present invention relates to a surface-treating agent for vulcanized rubber. More particularly, the present invention relates to a surface-treating agent for vulcanized rubber that further improves the hardness of the entire coating film, abrasion resistance, and product torque evaluation.BACKGROUND ART[0003]Graphite coating films, coating films of metal salts or amides of fatty acids, waxes such as paraffin, silicone oil, and the like, or coating films containing ethyl cellulose, phenolic resin, or the like as a binder are conventionally formed on the surface of rubber layers of rubber-coated metal gaskets, o...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C08K3/34C08L15/02C09D127/12C09D7/40C09D109/00C09D175/04C08L15/00C08L27/12C08L83/04F16J15/3204B32B25/16C08G18/10C08G18/69C08F214/18B32B27/26
CPCC09D127/12B32B25/16B32B27/26C08F214/18C08G18/10C08G18/69C08K3/34C08L15/00C08L15/02C08L27/12C08L83/04C09D7/40C09D109/00C09D175/04F16J15/3204C08K5/02C08L27/18C08L2666/32C08L2666/06C08G18/6279C08G18/62
Inventor KIMURA, NATSUMIABE, KATSUMI
Owner NOK CORP